Which of the following best describes how green plants affect the abiotic environment in ways that are advantageous to humans?

• A. They block sunlight from reaching Earth's surface, lowering global temperatures.
• B. They release large amounts of carbon dioxide, contributing to global warming.
• C. They increase atmospheric oxygen levels through photosynthesis, supporting aerobic life.
• D. They decrease soil fertility by absorbing all available nutrients.

Answer: (C)

Verified step by step guidance

1. Understand the role of green plants in the abiotic environment: Green plants are primary producers that interact with non-living components of the environment, such as air, water, and soil, through processes like photosynthesis and nutrient cycling.
2. Recall the process of photosynthesis: Green plants use sunlight, carbon dioxide (CO₂), and water (H₂O) to produce glucose (C₆H₁₂O₆) and oxygen (O₂). The chemical equation for photosynthesis is: $6_{\mathrm{CO}}+6_H\to C_6{H}_{\mathrm{12}}{O}_6+6_O$. This process increases atmospheric oxygen levels, which is essential for aerobic organisms, including humans.
3. Evaluate the incorrect options: Green plants do not block sunlight to lower global temperatures; instead, they absorb sunlight for photosynthesis. They do not release large amounts of CO₂; they absorb CO₂ during photosynthesis. Additionally, green plants contribute to soil fertility by cycling nutrients, rather than depleting them.
4. Focus on the correct option: Green plants increase atmospheric oxygen levels through photosynthesis, which supports aerobic life forms, including humans. This is a direct benefit to the abiotic environment and human survival.
5. Conclude the reasoning: The correct answer is that green plants increase atmospheric oxygen levels through photosynthesis, which is advantageous to humans by supporting aerobic life and maintaining a balanced atmosphere.